Buick LeSabre 1965 Service Manual page 770

ACCESSORIES
OPTIONAL HEATER-AIR CONDITIONER SYSTEM 11 - 3 7
b. Compressor Specifications (Cont'd.)
Oil Frigidaire 525 Viscosity
Oil Content (New) 10-1/2 oz. Fluid
Internal Clearances See Figure 11-102
Air Gap Between Clutch Drive Plate and Pulley 022" to .057"
Clutch Type Magnetic
Belt Tension See Figures 2-50 and 2-51
c. Miscellaneous Specifications
Refrigerant Freon 12, Ucon 12, Genetron 12, Isotron 12
System Capacity (Fulley Charged) 45000, 46000 and 48000 - 4-1/4 lbs.
49000 - 3-3/4 lbs.
Blower Motor Fuse 30 Amp. Located on Fuse Block
Type of Temperature Control Suction Throttle Valve
1 1 - 1 1 DESCRIPTION AND
OPERATION OF
OPTIONAL HEATER-
AIR CONDITIONER
SYSTEM
a. 45000, 46000 and
48000 Series
The heater-air conditioner system
for the 45000, 46000 and 48000
Series cars is a series type, air
mix system. The air flows thru
the evaporator core, and then may
either flow thru, around, or both
thru and around the heater core.
This arrangement a f f o r d s the
driver with the advantage of being
able to c o o l the a i r (to de-
humidify) and then reheat the air
as may be required on cool, damp
days. The temperature of the air
is controlled by regulation of the
mixture between hot and cold air.
A vacuum operated water valve
is provided to control the flow of
coolant to the heater core.
b. 49000 Series
The 49000 Series heater-air con-
ditioner system is an air mix
type system; however, the air
ducts are situated such that the
air flow for air conditioning and
the air flow for heating are en-
tirely separate. The temperature
of the heated air is controlled by
regulation of the mixture of hot
and cold air. The heater portion
of the heater-air conditioner sys-
tem for 49000 Series cars is the
same heater used for non-air
conditioned cars. For further in-
formation pertaining to the heater
system refer to Section 11-B.
c. Both Systems,
45000, 46000, 48000,
and 49000 Series
Both the 45000, 46000 and 48000
Series system and the 49000 Se-
ries system are similar in that
the components of the refriger-
ating circuit are basically identi-
cal e x c e p t for v a r i a t i o n s in
mounting of the components in
the engine compartment, adjust-
ment valves and capacities. Both
systems use the following com-
ponents in t h e i r refrigeration
circuit: (1) compressor, (2) con-
denser, (3) receiver-dehydrator,
(4) evaporator, (5) suction throttle
valve, (6) expansion valve, and
(7) muffler (see Figures 11-48
and 11-49).
A larger capacity radiator and
fan to increase cooling system
efficiently are included on all fac-
tory equipped cars with air con-
ditioner. Also, a fan clutch is
used.
Air conditioner equipped c a r s
have the fuel vapor by-pass sys-
tem. This consists of a special
fuel filter and fuel return lines
which allow a constant flow of fuel
from gas tank to filter and back
to tank. This reduces the pos-
sibility of vapor lock when oper-
ating in extremely hot weather.
Any service work that requires
loosening a refrigerant line con-
nection should be performed only
by qualified service personnel
who have attended either Buick or
other automotive air conditioner
training s c h o o l s . Whenever a
hose or pipe is disconnected from
any unit, refrigerant will escape.
Any work involving the handling
of refrigerants requires special
equipment and a knowledge of its
proper use.
The air conditioner uses Schrader
valve fittings instead of shut-off
service valves; therefore, when-
ever a part is removed that is
in the refrigeration circuit or a
line disconnected, the refrigerant
must be discharged from system
as described in paragraph 11-15,
d. Description of Components
NOTE: See paragraph 11-12 for
description of compressor.
1. Hoses. The connecting ele-
ments are made from a high tem-
perature, high pressure synthetic